Synthesis and Biological Evaluation of Phenylacetyl Derivatives Having Low Central Nervous System Permeability as Potent and Selective M2 Muscarinic Receptor Antagonists.
作者:Toshihiro WATANABE、Akio KAKEFUDA、Akihiro TANAKA、Kenji TAKIZAWA、Seiko HIRANO、Hiroshi SHIBATA、Yoko YAMAGIWA、Isao YANAGISAWA
DOI:10.1248/cpb.46.53
日期:——
A series of phenylacetyl derivatives containing the 5, 10-dihydro-11H-dibenzo[b, e][1, 4]diazepin-11-one or 5, 11-dihydro-6H-pyrido[2, 3-b][1, 4]benzodiazepin-6-one skeleton was prepared and evaluated for their binding affinities to muscarinic receptors in vitro and for antagonism of bradycardia, salivation and tremor in vivo. Among them, compounds 56 and 66 had high affinity for M2 muscarinic receptors in the heart (pKi=8.7 and 8.9, respectively) with low affinity for M3 muscarinic receptors in the submandibular gland. A structure-activity relationship (SAR) study suggested that the high M2 selectivity over the M3 muscarinic receptors of 56 may be attributed to the direction of the carboxamide carbonyl group. In in vivo studies, 56 and 66 antagonized oxotremorine-induced bradycardina in rats on both intravenous and oral administration, and their heart rate increasing effect in dogs with nocturnal bradycardia was about 3-fold greater than that of AF-DX 116. Furthermore, they had almost no influence on oxotremorine-induced tremor in mice, presenting no evidence of central transfer.
一系列含有5,10-二氢-11H-二苯并[b,e][1,4]二氮杂卓-11-酮或5,11-二氢-6H-吡啶并[2,3-b][1,4]苯并二氮杂卓-6-酮骨架的苯乙酰基衍生物被制备并评估了它们与毒蕈碱受体在体外的结合亲和力以及对心动过缓、唾液分泌和震颤的体内拮抗作用。其中,化合物56和66对心脏中的M2毒蕈碱受体具有高亲和力(pKi分别为8.7和8.9),而对颌下腺中的M3毒蕈碱受体的亲和力较低。结构-活性关系(SAR)研究表明,56对M2受体的高选择性可能是由于酰胺羰基的定向。在体内研究中,56和66均能拮抗氧颤药引起的大鼠心动过缓,无论是静脉注射还是口服给药,且它们对夜间心动过缓的狗的心率增加效果是AF-DX 116的3倍左右。此外,它们对氧颤药引起的小鼠震颤几乎没有影响,无证据表明中枢转移。